<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2013 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    1.7.9, 2013-06-02
 */


/**
 * PHPExcel_Writer_Excel2007_Chart
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Writer_Excel2007_Chart extends PHPExcel_Writer_Excel2007_WriterPart {
	/**
	 * Write charts to XML format
	 *
	 * @param    PHPExcel_Chart $pChart
	 *
	 * @return    string                        XML Output
	 * @throws    PHPExcel_Writer_Exception
	 */
	public function writeChart(PHPExcel_Chart $pChart = null) {
		// Create XML writer
		$objWriter = null;
		if ($this->getParentWriter()->getUseDiskCaching())
		{
			$objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
		}
		else
		{
			$objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_MEMORY);
		}
		//	Ensure that data series values are up-to-date before we save
		$pChart->refresh();

		// XML header
		$objWriter->startDocument('1.0', 'UTF-8', 'yes');

		// c:chartSpace
		$objWriter->startElement('c:chartSpace');
		$objWriter->writeAttribute('xmlns:c', 'http://schemas.openxmlformats.org/drawingml/2006/chart');
		$objWriter->writeAttribute('xmlns:a', 'http://schemas.openxmlformats.org/drawingml/2006/main');
		$objWriter->writeAttribute('xmlns:r', 'http://schemas.openxmlformats.org/officeDocument/2006/relationships');

		$objWriter->startElement('c:date1904');
		$objWriter->writeAttribute('val', 0);
		$objWriter->endElement();
		$objWriter->startElement('c:lang');
		$objWriter->writeAttribute('val', "en-GB");
		$objWriter->endElement();
		$objWriter->startElement('c:roundedCorners');
		$objWriter->writeAttribute('val', 0);
		$objWriter->endElement();

		$this->_writeAlternateContent($objWriter);

		$objWriter->startElement('c:chart');

		$this->_writeTitle($pChart->getTitle(), $objWriter);

		$objWriter->startElement('c:autoTitleDeleted');
		$objWriter->writeAttribute('val', 0);
		$objWriter->endElement();

		$this->_writePlotArea($pChart->getPlotArea(), $pChart->getXAxisLabel(), $pChart->getYAxisLabel(), $objWriter, $pChart->getWorksheet());

		$this->_writeLegend($pChart->getLegend(), $objWriter);


		$objWriter->startElement('c:plotVisOnly');
		$objWriter->writeAttribute('val', 1);
		$objWriter->endElement();

		$objWriter->startElement('c:dispBlanksAs');
		$objWriter->writeAttribute('val', "gap");
		$objWriter->endElement();

		$objWriter->startElement('c:showDLblsOverMax');
		$objWriter->writeAttribute('val', 0);
		$objWriter->endElement();

		$objWriter->endElement();

		$this->_writePrintSettings($objWriter);

		$objWriter->endElement();

		// Return
		return $objWriter->getData();
	}

	/**
	 * Write Chart Title
	 *
	 * @param    PHPExcel_Chart_Title      $title
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeTitle(PHPExcel_Chart_Title $title = null, $objWriter) {
		if (is_null($title))
		{
			return;
		}

		$objWriter->startElement('c:title');
		$objWriter->startElement('c:tx');
		$objWriter->startElement('c:rich');

		$objWriter->startElement('a:bodyPr');
		$objWriter->endElement();

		$objWriter->startElement('a:lstStyle');
		$objWriter->endElement();

		$objWriter->startElement('a:p');

		$caption = $title->getCaption();
		if ((is_array($caption)) && (count($caption) > 0))
			$caption = $caption[0];
		$this->getParentWriter()->getWriterPart('stringtable')->writeRichTextForCharts($objWriter, $caption, 'a');

		$objWriter->endElement();
		$objWriter->endElement();
		$objWriter->endElement();

		$layout = $title->getLayout();
		$this->_writeLayout($layout, $objWriter);

		$objWriter->startElement('c:overlay');
		$objWriter->writeAttribute('val', 0);
		$objWriter->endElement();

		$objWriter->endElement();
	}

	/**
	 * Write Chart Legend
	 *
	 * @param    PHPExcel_Chart_Legend     $legend
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeLegend(PHPExcel_Chart_Legend $legend = null, $objWriter) {
		if (is_null($legend))
		{
			return;
		}

		$objWriter->startElement('c:legend');

		$objWriter->startElement('c:legendPos');
		$objWriter->writeAttribute('val', $legend->getPosition());
		$objWriter->endElement();

		$layout = $legend->getLayout();
		$this->_writeLayout($layout, $objWriter);

		$objWriter->startElement('c:overlay');
		$objWriter->writeAttribute('val', ($legend->getOverlay()) ? '1' : '0');
		$objWriter->endElement();

		$objWriter->startElement('c:txPr');
		$objWriter->startElement('a:bodyPr');
		$objWriter->endElement();

		$objWriter->startElement('a:lstStyle');
		$objWriter->endElement();

		$objWriter->startElement('a:p');
		$objWriter->startElement('a:pPr');
		$objWriter->writeAttribute('rtl', 0);

		$objWriter->startElement('a:defRPr');
		$objWriter->endElement();
		$objWriter->endElement();

		$objWriter->startElement('a:endParaRPr');
		$objWriter->writeAttribute('lang', "en-US");
		$objWriter->endElement();

		$objWriter->endElement();
		$objWriter->endElement();

		$objWriter->endElement();
	}

	/**
	 * Write Chart Plot Area
	 *
	 * @param    PHPExcel_Chart_PlotArea   $plotArea
	 * @param    PHPExcel_Chart_Title      $xAxisLabel
	 * @param    PHPExcel_Chart_Title      $yAxisLabel
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writePlotArea(PHPExcel_Chart_PlotArea $plotArea, PHPExcel_Chart_Title $xAxisLabel = null, PHPExcel_Chart_Title $yAxisLabel = null, $objWriter, PHPExcel_Worksheet $pSheet) {
		if (is_null($plotArea))
		{
			return;
		}

		$id1 = $id2 = 0;
		$this->_seriesIndex = 0;
		$objWriter->startElement('c:plotArea');

		$layout = $plotArea->getLayout();

		$this->_writeLayout($layout, $objWriter);

		$chartTypes = self::_getChartType($plotArea);
		$catIsMultiLevelSeries = $valIsMultiLevelSeries = false;
		$plotGroupingType = '';
		foreach ($chartTypes as $chartType)
		{
			$objWriter->startElement('c:' . $chartType);

			$groupCount = $plotArea->getPlotGroupCount();
			for ($i = 0; $i < $groupCount; ++$i)
			{
				$plotGroup = $plotArea->getPlotGroupByIndex($i);
				$groupType = $plotGroup->getPlotType();
				if ($groupType == $chartType)
				{

					$plotStyle = $plotGroup->getPlotStyle();
					if ($groupType === PHPExcel_Chart_DataSeries::TYPE_RADARCHART)
					{
						$objWriter->startElement('c:radarStyle');
						$objWriter->writeAttribute('val', $plotStyle);
						$objWriter->endElement();
					}
					elseif ($groupType === PHPExcel_Chart_DataSeries::TYPE_SCATTERCHART)
					{
						$objWriter->startElement('c:scatterStyle');
						$objWriter->writeAttribute('val', $plotStyle);
						$objWriter->endElement();
					}

					$this->_writePlotGroup($plotGroup, $chartType, $objWriter, $catIsMultiLevelSeries, $valIsMultiLevelSeries, $plotGroupingType, $pSheet);
				}
			}

			$this->_writeDataLbls($objWriter, $layout);

			if ($chartType === PHPExcel_Chart_DataSeries::TYPE_LINECHART)
			{
				//	Line only, Line3D can't be smoothed

				$objWriter->startElement('c:smooth');
				$objWriter->writeAttribute('val', (integer)$plotGroup->getSmoothLine());
				$objWriter->endElement();
			}
			elseif (($chartType === PHPExcel_Chart_DataSeries::TYPE_BARCHART) || ($chartType === PHPExcel_Chart_DataSeries::TYPE_BARCHART_3D))
			{

				$objWriter->startElement('c:gapWidth');
				$objWriter->writeAttribute('val', 150);
				$objWriter->endElement();

				if ($plotGroupingType == 'percentStacked' || $plotGroupingType == 'stacked')
				{

					$objWriter->startElement('c:overlap');
					$objWriter->writeAttribute('val', 100);
					$objWriter->endElement();
				}
			}
			elseif ($chartType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART)
			{

				$objWriter->startElement('c:bubbleScale');
				$objWriter->writeAttribute('val', 25);
				$objWriter->endElement();

				$objWriter->startElement('c:showNegBubbles');
				$objWriter->writeAttribute('val', 0);
				$objWriter->endElement();
			}
			elseif ($chartType === PHPExcel_Chart_DataSeries::TYPE_STOCKCHART)
			{

				$objWriter->startElement('c:hiLowLines');
				$objWriter->endElement();
			}

			//	Generate 2 unique numbers to use for axId values
			//					$id1 = $id2 = rand(10000000,99999999);
			//					do {
			//						$id2 = rand(10000000,99999999);
			//					} while ($id1 == $id2);
			$id1 = '75091328';
			$id2 = '75089408';

			if (($chartType !== PHPExcel_Chart_DataSeries::TYPE_PIECHART) && ($chartType !== PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) && ($chartType !== PHPExcel_Chart_DataSeries::TYPE_DONUTCHART))
			{

				$objWriter->startElement('c:axId');
				$objWriter->writeAttribute('val', $id1);
				$objWriter->endElement();
				$objWriter->startElement('c:axId');
				$objWriter->writeAttribute('val', $id2);
				$objWriter->endElement();
			}
			else
			{
				$objWriter->startElement('c:firstSliceAng');
				$objWriter->writeAttribute('val', 0);
				$objWriter->endElement();

				if ($chartType === PHPExcel_Chart_DataSeries::TYPE_DONUTCHART)
				{

					$objWriter->startElement('c:holeSize');
					$objWriter->writeAttribute('val', 50);
					$objWriter->endElement();
				}
			}

			$objWriter->endElement();
		}

		if (($chartType !== PHPExcel_Chart_DataSeries::TYPE_PIECHART) && ($chartType !== PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) && ($chartType !== PHPExcel_Chart_DataSeries::TYPE_DONUTCHART))
		{

			if ($chartType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART)
			{
				$this->_writeValAx($objWriter, $plotArea, $xAxisLabel, $chartType, $id1, $id2, $catIsMultiLevelSeries);
			}
			else
			{
				$this->_writeCatAx($objWriter, $plotArea, $xAxisLabel, $chartType, $id1, $id2, $catIsMultiLevelSeries);
			}

			$this->_writeValAx($objWriter, $plotArea, $yAxisLabel, $chartType, $id1, $id2, $valIsMultiLevelSeries);
		}

		$objWriter->endElement();
	}

	/**
	 * Write Data Labels
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter   XML Writer
	 * @param    PHPExcel_Chart_Layout     $chartLayout Chart layout
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeDataLbls($objWriter, $chartLayout) {
		$objWriter->startElement('c:dLbls');

		$objWriter->startElement('c:showLegendKey');
		$showLegendKey = (empty($chartLayout)) ? 0 : $chartLayout->getShowLegendKey();
		$objWriter->writeAttribute('val', ((empty($showLegendKey)) ? 0 : 1));
		$objWriter->endElement();


		$objWriter->startElement('c:showVal');
		$showVal = (empty($chartLayout)) ? 0 : $chartLayout->getShowVal();
		$objWriter->writeAttribute('val', ((empty($showVal)) ? 0 : 1));
		$objWriter->endElement();

		$objWriter->startElement('c:showCatName');
		$showCatName = (empty($chartLayout)) ? 0 : $chartLayout->getShowCatName();
		$objWriter->writeAttribute('val', ((empty($showCatName)) ? 0 : 1));
		$objWriter->endElement();

		$objWriter->startElement('c:showSerName');
		$showSerName = (empty($chartLayout)) ? 0 : $chartLayout->getShowSerName();
		$objWriter->writeAttribute('val', ((empty($showSerName)) ? 0 : 1));
		$objWriter->endElement();

		$objWriter->startElement('c:showPercent');
		$showPercent = (empty($chartLayout)) ? 0 : $chartLayout->getShowPercent();
		$objWriter->writeAttribute('val', ((empty($showPercent)) ? 0 : 1));
		$objWriter->endElement();

		$objWriter->startElement('c:showBubbleSize');
		$showBubbleSize = (empty($chartLayout)) ? 0 : $chartLayout->getShowBubbleSize();
		$objWriter->writeAttribute('val', ((empty($showBubbleSize)) ? 0 : 1));
		$objWriter->endElement();

		$objWriter->startElement('c:showLeaderLines');
		$showLeaderLines = (empty($chartLayout)) ? 1 : $chartLayout->getShowLeaderLines();
		$objWriter->writeAttribute('val', ((empty($showLeaderLines)) ? 0 : 1));
		$objWriter->endElement();

		$objWriter->endElement();
	}

	/**
	 * Write Category Axis
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Chart_PlotArea   $plotArea
	 * @param    PHPExcel_Chart_Title      $xAxisLabel
	 * @param    string                    $groupType Chart type
	 * @param    string                    $id1
	 * @param    string                    $id2
	 * @param    boolean                   $isMultiLevelSeries
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeCatAx($objWriter, PHPExcel_Chart_PlotArea $plotArea, $xAxisLabel, $groupType, $id1, $id2, $isMultiLevelSeries) {
		$objWriter->startElement('c:catAx');

		if ($id1 > 0)
		{
			$objWriter->startElement('c:axId');
			$objWriter->writeAttribute('val', $id1);
			$objWriter->endElement();
		}

		$objWriter->startElement('c:scaling');
		$objWriter->startElement('c:orientation');
		$objWriter->writeAttribute('val', "minMax");
		$objWriter->endElement();
		$objWriter->endElement();

		$objWriter->startElement('c:delete');
		$objWriter->writeAttribute('val', 0);
		$objWriter->endElement();

		$objWriter->startElement('c:axPos');
		$objWriter->writeAttribute('val', "b");
		$objWriter->endElement();

		if (!is_null($xAxisLabel))
		{
			$objWriter->startElement('c:title');
			$objWriter->startElement('c:tx');
			$objWriter->startElement('c:rich');

			$objWriter->startElement('a:bodyPr');
			$objWriter->endElement();

			$objWriter->startElement('a:lstStyle');
			$objWriter->endElement();

			$objWriter->startElement('a:p');
			$objWriter->startElement('a:r');

			$caption = $xAxisLabel->getCaption();
			if (is_array($caption))
				$caption = $caption[0];
			$objWriter->startElement('a:t');
			//										$objWriter->writeAttribute('xml:space', 'preserve');
			$objWriter->writeRawData(PHPExcel_Shared_String::ControlCharacterPHP2OOXML($caption));
			$objWriter->endElement();

			$objWriter->endElement();
			$objWriter->endElement();
			$objWriter->endElement();
			$objWriter->endElement();

			$layout = $xAxisLabel->getLayout();
			$this->_writeLayout($layout, $objWriter);

			$objWriter->startElement('c:overlay');
			$objWriter->writeAttribute('val', 0);
			$objWriter->endElement();

			$objWriter->endElement();

		}

		$objWriter->startElement('c:numFmt');
		$objWriter->writeAttribute('formatCode', "General");
		$objWriter->writeAttribute('sourceLinked', 1);
		$objWriter->endElement();

		$objWriter->startElement('c:majorTickMark');
		$objWriter->writeAttribute('val', "out");
		$objWriter->endElement();

		$objWriter->startElement('c:minorTickMark');
		$objWriter->writeAttribute('val', "none");
		$objWriter->endElement();

		$objWriter->startElement('c:tickLblPos');
		$objWriter->writeAttribute('val', "nextTo");
		$objWriter->endElement();

		if ($id2 > 0)
		{
			$objWriter->startElement('c:crossAx');
			$objWriter->writeAttribute('val', $id2);
			$objWriter->endElement();

			$objWriter->startElement('c:crosses');
			$objWriter->writeAttribute('val', "autoZero");
			$objWriter->endElement();
		}

		$objWriter->startElement('c:auto');
		$objWriter->writeAttribute('val', 1);
		$objWriter->endElement();

		$objWriter->startElement('c:lblAlgn');
		$objWriter->writeAttribute('val', "ctr");
		$objWriter->endElement();

		$objWriter->startElement('c:lblOffset');
		$objWriter->writeAttribute('val', 100);
		$objWriter->endElement();

		if ($isMultiLevelSeries)
		{
			$objWriter->startElement('c:noMultiLvlLbl');
			$objWriter->writeAttribute('val', 0);
			$objWriter->endElement();
		}
		$objWriter->endElement();

	}


	/**
	 * Write Value Axis
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 * @param    PHPExcel_Chart_PlotArea   $plotArea
	 * @param    PHPExcel_Chart_Title      $yAxisLabel
	 * @param    string                    $groupType Chart type
	 * @param    string                    $id1
	 * @param    string                    $id2
	 * @param    boolean                   $isMultiLevelSeries
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeValAx($objWriter, PHPExcel_Chart_PlotArea $plotArea, $yAxisLabel, $groupType, $id1, $id2, $isMultiLevelSeries) {
		$objWriter->startElement('c:valAx');

		if ($id2 > 0)
		{
			$objWriter->startElement('c:axId');
			$objWriter->writeAttribute('val', $id2);
			$objWriter->endElement();
		}

		$objWriter->startElement('c:scaling');
		$objWriter->startElement('c:orientation');
		$objWriter->writeAttribute('val', "minMax");
		$objWriter->endElement();
		$objWriter->endElement();

		$objWriter->startElement('c:delete');
		$objWriter->writeAttribute('val', 0);
		$objWriter->endElement();

		$objWriter->startElement('c:axPos');
		$objWriter->writeAttribute('val', "l");
		$objWriter->endElement();

		$objWriter->startElement('c:majorGridlines');
		$objWriter->endElement();

		if (!is_null($yAxisLabel))
		{
			$objWriter->startElement('c:title');
			$objWriter->startElement('c:tx');
			$objWriter->startElement('c:rich');

			$objWriter->startElement('a:bodyPr');
			$objWriter->endElement();

			$objWriter->startElement('a:lstStyle');
			$objWriter->endElement();

			$objWriter->startElement('a:p');
			$objWriter->startElement('a:r');

			$caption = $yAxisLabel->getCaption();
			if (is_array($caption))
				$caption = $caption[0];
			$objWriter->startElement('a:t');
			//										$objWriter->writeAttribute('xml:space', 'preserve');
			$objWriter->writeRawData(PHPExcel_Shared_String::ControlCharacterPHP2OOXML($caption));
			$objWriter->endElement();

			$objWriter->endElement();
			$objWriter->endElement();
			$objWriter->endElement();
			$objWriter->endElement();

			if ($groupType !== PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART)
			{
				$layout = $yAxisLabel->getLayout();
				$this->_writeLayout($layout, $objWriter);
			}

			$objWriter->startElement('c:overlay');
			$objWriter->writeAttribute('val', 0);
			$objWriter->endElement();

			$objWriter->endElement();
		}

		$objWriter->startElement('c:numFmt');
		$objWriter->writeAttribute('formatCode', "General");
		$objWriter->writeAttribute('sourceLinked', 1);
		$objWriter->endElement();

		$objWriter->startElement('c:majorTickMark');
		$objWriter->writeAttribute('val', "out");
		$objWriter->endElement();

		$objWriter->startElement('c:minorTickMark');
		$objWriter->writeAttribute('val', "none");
		$objWriter->endElement();

		$objWriter->startElement('c:tickLblPos');
		$objWriter->writeAttribute('val', "nextTo");
		$objWriter->endElement();

		if ($id1 > 0)
		{
			$objWriter->startElement('c:crossAx');
			$objWriter->writeAttribute('val', $id2);
			$objWriter->endElement();

			$objWriter->startElement('c:crosses');
			$objWriter->writeAttribute('val', "autoZero");
			$objWriter->endElement();

			$objWriter->startElement('c:crossBetween');
			$objWriter->writeAttribute('val', "midCat");
			$objWriter->endElement();
		}

		if ($isMultiLevelSeries)
		{
			if ($groupType !== PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART)
			{
				$objWriter->startElement('c:noMultiLvlLbl');
				$objWriter->writeAttribute('val', 0);
				$objWriter->endElement();
			}
		}
		$objWriter->endElement();

	}


	/**
	 * Get the data series type(s) for a chart plot series
	 *
	 * @param    PHPExcel_Chart_PlotArea $plotArea
	 *
	 * @return    string|array
	 * @throws    PHPExcel_Writer_Exception
	 */
	private static function _getChartType($plotArea) {
		$groupCount = $plotArea->getPlotGroupCount();

		if ($groupCount == 1)
		{
			$chartType = array($plotArea->getPlotGroupByIndex(0)->getPlotType());
		}
		else
		{
			$chartTypes = array();
			for ($i = 0; $i < $groupCount; ++$i)
			{
				$chartTypes[] = $plotArea->getPlotGroupByIndex($i)->getPlotType();
			}
			$chartType = array_unique($chartTypes);
			if (count($chartTypes) == 0)
			{
				throw new PHPExcel_Writer_Exception('Chart is not yet implemented');
			}
		}

		return $chartType;
	}

	/**
	 * Write Plot Group (series of related plots)
	 *
	 * @param    PHPExcel_Chart_DataSeries $plotGroup
	 * @param    string                    $groupType              Type of plot for dataseries
	 * @param    PHPExcel_Shared_XMLWriter $objWriter              XML Writer
	 * @param    boolean                   &$catIsMultiLevelSeries Is category a multi-series category
	 * @param    boolean                   &$valIsMultiLevelSeries Is value set a multi-series set
	 * @param    string                    &$plotGroupingType      Type of grouping for multi-series values
	 * @param    PHPExcel_Worksheet        $pSheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writePlotGroup($plotGroup, $groupType, $objWriter, &$catIsMultiLevelSeries, &$valIsMultiLevelSeries, &$plotGroupingType, PHPExcel_Worksheet $pSheet) {
		if (is_null($plotGroup))
		{
			return;
		}

		if (($groupType == PHPExcel_Chart_DataSeries::TYPE_BARCHART) || ($groupType == PHPExcel_Chart_DataSeries::TYPE_BARCHART_3D))
		{
			$objWriter->startElement('c:barDir');
			$objWriter->writeAttribute('val', $plotGroup->getPlotDirection());
			$objWriter->endElement();
		}

		if (!is_null($plotGroup->getPlotGrouping()))
		{
			$plotGroupingType = $plotGroup->getPlotGrouping();
			$objWriter->startElement('c:grouping');
			$objWriter->writeAttribute('val', $plotGroupingType);
			$objWriter->endElement();
		}

		//	Get these details before the loop, because we can use the count to check for varyColors
		$plotSeriesOrder = $plotGroup->getPlotOrder();
		$plotSeriesCount = count($plotSeriesOrder);

		if (($groupType !== PHPExcel_Chart_DataSeries::TYPE_RADARCHART) && ($groupType !== PHPExcel_Chart_DataSeries::TYPE_STOCKCHART))
		{

			if ($groupType !== PHPExcel_Chart_DataSeries::TYPE_LINECHART)
			{
				if (($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART) || ($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) || ($groupType == PHPExcel_Chart_DataSeries::TYPE_DONUTCHART) || ($plotSeriesCount > 1))
				{
					$objWriter->startElement('c:varyColors');
					$objWriter->writeAttribute('val', 1);
					$objWriter->endElement();
				}
				else
				{
					$objWriter->startElement('c:varyColors');
					$objWriter->writeAttribute('val', 0);
					$objWriter->endElement();
				}
			}
		}

		foreach ($plotSeriesOrder as $plotSeriesIdx => $plotSeriesRef)
		{
			$objWriter->startElement('c:ser');

			$objWriter->startElement('c:idx');
			$objWriter->writeAttribute('val', $this->_seriesIndex + $plotSeriesIdx);
			$objWriter->endElement();

			$objWriter->startElement('c:order');
			$objWriter->writeAttribute('val', $this->_seriesIndex + $plotSeriesRef);
			$objWriter->endElement();

			if (($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART) || ($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) || ($groupType == PHPExcel_Chart_DataSeries::TYPE_DONUTCHART))
			{

				$objWriter->startElement('c:dPt');
				$objWriter->startElement('c:idx');
				$objWriter->writeAttribute('val', 3);
				$objWriter->endElement();

				$objWriter->startElement('c:bubble3D');
				$objWriter->writeAttribute('val', 0);
				$objWriter->endElement();

				$objWriter->startElement('c:spPr');
				$objWriter->startElement('a:solidFill');
				$objWriter->startElement('a:srgbClr');
				$objWriter->writeAttribute('val', 'FF9900');
				$objWriter->endElement();
				$objWriter->endElement();
				$objWriter->endElement();
				$objWriter->endElement();
			}

			//	Labels
			$plotSeriesLabel = $plotGroup->getPlotLabelByIndex($plotSeriesRef);
			if ($plotSeriesLabel && ($plotSeriesLabel->getPointCount() > 0))
			{
				$objWriter->startElement('c:tx');
				$objWriter->startElement('c:strRef');
				$this->_writePlotSeriesLabel($plotSeriesLabel, $objWriter);
				$objWriter->endElement();
				$objWriter->endElement();
			}

			//	Formatting for the points
			if ($groupType == PHPExcel_Chart_DataSeries::TYPE_LINECHART)
			{
				$objWriter->startElement('c:spPr');
				$objWriter->startElement('a:ln');
				$objWriter->writeAttribute('w', 12700);
				$objWriter->endElement();
				$objWriter->endElement();
			}

			$plotSeriesValues = $plotGroup->getPlotValuesByIndex($plotSeriesRef);
			if ($plotSeriesValues)
			{
				$plotSeriesMarker = $plotSeriesValues->getPointMarker();
				if ($plotSeriesMarker)
				{
					$objWriter->startElement('c:marker');
					$objWriter->startElement('c:symbol');
					$objWriter->writeAttribute('val', $plotSeriesMarker);
					$objWriter->endElement();

					if ($plotSeriesMarker !== 'none')
					{
						$objWriter->startElement('c:size');
						$objWriter->writeAttribute('val', 3);
						$objWriter->endElement();
					}
					$objWriter->endElement();
				}
			}

			if (($groupType === PHPExcel_Chart_DataSeries::TYPE_BARCHART) || ($groupType === PHPExcel_Chart_DataSeries::TYPE_BARCHART_3D) || ($groupType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART))
			{

				$objWriter->startElement('c:invertIfNegative');
				$objWriter->writeAttribute('val', 0);
				$objWriter->endElement();
			}

			//	Category Labels
			$plotSeriesCategory = $plotGroup->getPlotCategoryByIndex($plotSeriesRef);
			if ($plotSeriesCategory && ($plotSeriesCategory->getPointCount() > 0))
			{
				$catIsMultiLevelSeries = $catIsMultiLevelSeries || $plotSeriesCategory->isMultiLevelSeries();

				if (($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART) || ($groupType == PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) || ($groupType == PHPExcel_Chart_DataSeries::TYPE_DONUTCHART))
				{

					if (!is_null($plotGroup->getPlotStyle()))
					{
						$plotStyle = $plotGroup->getPlotStyle();
						if ($plotStyle)
						{
							$objWriter->startElement('c:explosion');
							$objWriter->writeAttribute('val', 25);
							$objWriter->endElement();
						}
					}
				}

				if (($groupType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART) || ($groupType === PHPExcel_Chart_DataSeries::TYPE_SCATTERCHART))
				{
					$objWriter->startElement('c:xVal');
				}
				else
				{
					$objWriter->startElement('c:cat');
				}

				$this->_writePlotSeriesValues($plotSeriesCategory, $objWriter, $groupType, 'str', $pSheet);
				$objWriter->endElement();
			}

			//	Values
			if ($plotSeriesValues)
			{
				$valIsMultiLevelSeries = $valIsMultiLevelSeries || $plotSeriesValues->isMultiLevelSeries();

				if (($groupType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART) || ($groupType === PHPExcel_Chart_DataSeries::TYPE_SCATTERCHART))
				{
					$objWriter->startElement('c:yVal');
				}
				else
				{
					$objWriter->startElement('c:val');
				}

				$this->_writePlotSeriesValues($plotSeriesValues, $objWriter, $groupType, 'num', $pSheet);
				$objWriter->endElement();
			}

			if ($groupType === PHPExcel_Chart_DataSeries::TYPE_BUBBLECHART)
			{
				$this->_writeBubbles($plotSeriesValues, $objWriter, $pSheet);
			}

			$objWriter->endElement();

		}

		$this->_seriesIndex += $plotSeriesIdx + 1;
	}

	/**
	 * Write Plot Series Label
	 *
	 * @param    PHPExcel_Chart_DataSeriesValues $plotSeriesLabel
	 * @param    PHPExcel_Shared_XMLWriter       $objWriter XML Writer
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writePlotSeriesLabel($plotSeriesLabel, $objWriter) {
		if (is_null($plotSeriesLabel))
		{
			return;
		}

		$objWriter->startElement('c:f');
		$objWriter->writeRawData($plotSeriesLabel->getDataSource());
		$objWriter->endElement();

		$objWriter->startElement('c:strCache');
		$objWriter->startElement('c:ptCount');
		$objWriter->writeAttribute('val', $plotSeriesLabel->getPointCount());
		$objWriter->endElement();

		foreach ($plotSeriesLabel->getDataValues() as $plotLabelKey => $plotLabelValue)
		{
			$objWriter->startElement('c:pt');
			$objWriter->writeAttribute('idx', $plotLabelKey);

			$objWriter->startElement('c:v');
			$objWriter->writeRawData($plotLabelValue);
			$objWriter->endElement();
			$objWriter->endElement();
		}
		$objWriter->endElement();

	}

	/**
	 * Write Plot Series Values
	 *
	 * @param    PHPExcel_Chart_DataSeriesValues $plotSeriesValues
	 * @param    PHPExcel_Shared_XMLWriter       $objWriter XML Writer
	 * @param    string                          $groupType Type of plot for dataseries
	 * @param    string                          $dataType  Datatype of series values
	 * @param    PHPExcel_Worksheet              $pSheet
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writePlotSeriesValues($plotSeriesValues, $objWriter, $groupType, $dataType = 'str', PHPExcel_Worksheet $pSheet) {
		if (is_null($plotSeriesValues))
		{
			return;
		}

		if ($plotSeriesValues->isMultiLevelSeries())
		{
			$levelCount = $plotSeriesValues->multiLevelCount();

			$objWriter->startElement('c:multiLvlStrRef');

			$objWriter->startElement('c:f');
			$objWriter->writeRawData($plotSeriesValues->getDataSource());
			$objWriter->endElement();

			$objWriter->startElement('c:multiLvlStrCache');

			$objWriter->startElement('c:ptCount');
			$objWriter->writeAttribute('val', $plotSeriesValues->getPointCount());
			$objWriter->endElement();

			for ($level = 0; $level < $levelCount; ++$level)
			{
				$objWriter->startElement('c:lvl');

				foreach ($plotSeriesValues->getDataValues() as $plotSeriesKey => $plotSeriesValue)
				{
					if (isset($plotSeriesValue[$level]))
					{
						$objWriter->startElement('c:pt');
						$objWriter->writeAttribute('idx', $plotSeriesKey);

						$objWriter->startElement('c:v');
						$objWriter->writeRawData($plotSeriesValue[$level]);
						$objWriter->endElement();
						$objWriter->endElement();
					}
				}

				$objWriter->endElement();
			}

			$objWriter->endElement();

			$objWriter->endElement();
		}
		else
		{
			$objWriter->startElement('c:' . $dataType . 'Ref');

			$objWriter->startElement('c:f');
			$objWriter->writeRawData($plotSeriesValues->getDataSource());
			$objWriter->endElement();

			$objWriter->startElement('c:' . $dataType . 'Cache');

			if (($groupType != PHPExcel_Chart_DataSeries::TYPE_PIECHART) && ($groupType != PHPExcel_Chart_DataSeries::TYPE_PIECHART_3D) && ($groupType != PHPExcel_Chart_DataSeries::TYPE_DONUTCHART))
			{

				if (($plotSeriesValues->getFormatCode() !== null) && ($plotSeriesValues->getFormatCode() !== ''))
				{
					$objWriter->startElement('c:formatCode');
					$objWriter->writeRawData($plotSeriesValues->getFormatCode());
					$objWriter->endElement();
				}
			}

			$objWriter->startElement('c:ptCount');
			$objWriter->writeAttribute('val', $plotSeriesValues->getPointCount());
			$objWriter->endElement();

			$dataValues = $plotSeriesValues->getDataValues();
			if (!empty($dataValues))
			{
				if (is_array($dataValues))
				{
					foreach ($dataValues as $plotSeriesKey => $plotSeriesValue)
					{
						$objWriter->startElement('c:pt');
						$objWriter->writeAttribute('idx', $plotSeriesKey);

						$objWriter->startElement('c:v');
						$objWriter->writeRawData($plotSeriesValue);
						$objWriter->endElement();
						$objWriter->endElement();
					}
				}
			}

			$objWriter->endElement();

			$objWriter->endElement();
		}
	}

	/**
	 * Write Bubble Chart Details
	 *
	 * @param    PHPExcel_Chart_DataSeriesValues $plotSeriesValues
	 * @param    PHPExcel_Shared_XMLWriter       $objWriter XML Writer
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeBubbles($plotSeriesValues, $objWriter, PHPExcel_Worksheet $pSheet) {
		if (is_null($plotSeriesValues))
		{
			return;
		}

		$objWriter->startElement('c:bubbleSize');
		$objWriter->startElement('c:numLit');

		$objWriter->startElement('c:formatCode');
		$objWriter->writeRawData('General');
		$objWriter->endElement();

		$objWriter->startElement('c:ptCount');
		$objWriter->writeAttribute('val', $plotSeriesValues->getPointCount());
		$objWriter->endElement();

		$dataValues = $plotSeriesValues->getDataValues();
		if (!empty($dataValues))
		{
			if (is_array($dataValues))
			{
				foreach ($dataValues as $plotSeriesKey => $plotSeriesValue)
				{
					$objWriter->startElement('c:pt');
					$objWriter->writeAttribute('idx', $plotSeriesKey);
					$objWriter->startElement('c:v');
					$objWriter->writeRawData(1);
					$objWriter->endElement();
					$objWriter->endElement();
				}
			}
		}

		$objWriter->endElement();
		$objWriter->endElement();

		$objWriter->startElement('c:bubble3D');
		$objWriter->writeAttribute('val', 0);
		$objWriter->endElement();
	}

	/**
	 * Write Layout
	 *
	 * @param    PHPExcel_Chart_Layout     $layout
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeLayout(PHPExcel_Chart_Layout $layout = null, $objWriter) {
		$objWriter->startElement('c:layout');

		if (!is_null($layout))
		{
			$objWriter->startElement('c:manualLayout');

			$layoutTarget = $layout->getLayoutTarget();
			if (!is_null($layoutTarget))
			{
				$objWriter->startElement('c:layoutTarget');
				$objWriter->writeAttribute('val', $layoutTarget);
				$objWriter->endElement();
			}

			$xMode = $layout->getXMode();
			if (!is_null($xMode))
			{
				$objWriter->startElement('c:xMode');
				$objWriter->writeAttribute('val', $xMode);
				$objWriter->endElement();
			}

			$yMode = $layout->getYMode();
			if (!is_null($yMode))
			{
				$objWriter->startElement('c:yMode');
				$objWriter->writeAttribute('val', $yMode);
				$objWriter->endElement();
			}

			$x = $layout->getXPosition();
			if (!is_null($x))
			{
				$objWriter->startElement('c:x');
				$objWriter->writeAttribute('val', $x);
				$objWriter->endElement();
			}

			$y = $layout->getYPosition();
			if (!is_null($y))
			{
				$objWriter->startElement('c:y');
				$objWriter->writeAttribute('val', $y);
				$objWriter->endElement();
			}

			$w = $layout->getWidth();
			if (!is_null($w))
			{
				$objWriter->startElement('c:w');
				$objWriter->writeAttribute('val', $w);
				$objWriter->endElement();
			}

			$h = $layout->getHeight();
			if (!is_null($h))
			{
				$objWriter->startElement('c:h');
				$objWriter->writeAttribute('val', $h);
				$objWriter->endElement();
			}

			$objWriter->endElement();
		}

		$objWriter->endElement();
	}

	/**
	 * Write Alternate Content block
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeAlternateContent($objWriter) {
		$objWriter->startElement('mc:AlternateContent');
		$objWriter->writeAttribute('xmlns:mc', 'http://schemas.openxmlformats.org/markup-compatibility/2006');

		$objWriter->startElement('mc:Choice');
		$objWriter->writeAttribute('xmlns:c14', 'http://schemas.microsoft.com/office/drawing/2007/8/2/chart');
		$objWriter->writeAttribute('Requires', 'c14');

		$objWriter->startElement('c14:style');
		$objWriter->writeAttribute('val', '102');
		$objWriter->endElement();
		$objWriter->endElement();

		$objWriter->startElement('mc:Fallback');
		$objWriter->startElement('c:style');
		$objWriter->writeAttribute('val', '2');
		$objWriter->endElement();
		$objWriter->endElement();

		$objWriter->endElement();
	}

	/**
	 * Write Printer Settings
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter XML Writer
	 *
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writePrintSettings($objWriter) {
		$objWriter->startElement('c:printSettings');

		$objWriter->startElement('c:headerFooter');
		$objWriter->endElement();

		$objWriter->startElement('c:pageMargins');
		$objWriter->writeAttribute('footer', 0.3);
		$objWriter->writeAttribute('header', 0.3);
		$objWriter->writeAttribute('r', 0.7);
		$objWriter->writeAttribute('l', 0.7);
		$objWriter->writeAttribute('t', 0.75);
		$objWriter->writeAttribute('b', 0.75);
		$objWriter->endElement();

		$objWriter->startElement('c:pageSetup');
		$objWriter->writeAttribute('orientation', "portrait");
		$objWriter->endElement();

		$objWriter->endElement();
	}

}
